Method and apparatus for retaining weighted fluid in a tubular section
US9835008B2 · kind B2 · utility
5Cited by
21References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 15, 2014 |
| Grant date | Dec 5, 2017 |
| Priority date | — |
| Expiry date | Jan 15, 2034 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B34/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A floating apparatus for use in a casing string and especially for use in offshore casing operations. The apparatus includes a valve configured such that, when there is a pressure differential across the valve below a predetermined mid-pressure threshold, the valve prevents fluid flow and, when the pressure differential exceeds a predetermined high-pressure threshold, said valve non-resiliently allows fluid flow across the valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.